Improved performance and stability of photoelectrochemical water-splitting Si system using a bifacial design to decouple light harvesting and electrocatalysis

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

9 Scopus Citations
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Author(s)

  • Hui-Chun Fu
  • Purushothaman Varadhan
  • Meng-Lin Tsai
  • Wenjie Li
  • Qi Ding
  • Chun-Ho Lin
  • Marcella Bonifazi
  • Andrea Fratalocchi
  • Song Jin

Detail(s)

Original languageEnglish
Article number104478
Journal / PublicationNano Energy
Volume70
Online published13 Jan 2020
Publication statusPublished - Apr 2020

Abstract

Photoelectrochemical (PEC) splitting of water into hydrogen and oxygen is a promising way for the production of clean, and storable form of fuel but the PEC efficiency has remained low. Herein, we demonstrate enhanced light harvesting, charge carrier separation/transfer, and catalyst management with bifacial design for the Si-based photocathodes to achieve best-in-class hydrogen generation with excellent electrochemical stability. Decoupling the light harvesting side from the electrocatalytic surface nullifies parasitic light absorption and enables Si photocathodes that exhibit a photocurrent density of 39.01 mA/cm2 and stability over 370 h in 1 M H2SO4(aq) electrolyte due to fully covered a 15 nm Pt without any intentional protective layer. Furthermore, the bifacial Si photocathode system with semi-transparent Pt layer of 5 nm developed herein are capable of collecting sunlight not only on the light harvesting side but also on the back side of the device, resulting in a photocurrent density of 61.20 mA/cm2 under bifacial two-sun illumination, which yields 56.88% of excess hydrogen when compared to the monofacial PEC system. Combining the bifacial design with surface texturing and antireflection coating enables excellent omnidirectional light harvesting capability with a record hydrogen (photocurrent) generation, which provides a promising way to realize practical PEC water splitting applications.

Research Area(s)

  • Bifacial, Photoelectrochemical, Photoelectrodes, Solar cells, Water spliting

Citation Format(s)

Improved performance and stability of photoelectrochemical water-splitting Si system using a bifacial design to decouple light harvesting and electrocatalysis. / Fu, Hui-Chun; Varadhan, Purushothaman; Tsai, Meng-Lin; Li, Wenjie; Ding, Qi; Lin, Chun-Ho; Bonifazi, Marcella; Fratalocchi, Andrea; Jin, Song; He, Jr-Hau.

In: Nano Energy, Vol. 70, 104478, 04.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal